<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>盒子边框的设置</title>
    <style>
       div{
           /* 设置盒子大小 */
           width: 150px;
           height: 300px;
           /* 设置边框 */
           /* border-width:5px; 
           border-style: dotted;
           border-color: orange; */
           border: 1px solid red;
       }
    </style>
</head>
<body>
    <!-- 盒子 -->
    <div></div>
</body>
</html>